APC UPS runtimes all wrong...
 

Greetings:

I have an APC SmartUPS 1400RM that I just replaced the (now dead)
included batteries with a pair of 75AH deep cycle marine cells (L/A)
hooked up in series (24V system). At 48% load my runtime is
rediculously small (It's showing me 0 minutes right now)... I've run a
runtime calibration on the UPS, but that doesn't seem to have
helped... Doew anyone have any suggestions, or is this truely the kind
of performance I can expect?...

Thanks,
Richard W.

wrote in message
...
Greetings:

I have an APC SmartUPS 1400RM that I just replaced the (now dead)
included batteries with a pair of 75AH deep cycle marine cells (L/A)
hooked up in series (24V system). At 48% load my runtime is
rediculously small (It's showing me 0 minutes right now)... I've run a
runtime calibration on the UPS, but that doesn't seem to have
helped... Doew anyone have any suggestions, or is this truely the kind
of performance I can expect?...

Thanks,
Richard W.


Whatever measurement mechanism it uses probably is out of range for those
big batteries, I would suspect you'll get far more run time than the
original cells provided, best test would be to try it out while monitoring
the battery voltage with a multimeter. Shut it down when they drop to 10v or
so.

Try disconnecting the smart cable and the AC cord and let the
UPS run under your regular load until it shuts itself down.

There appear to be two different runtime calibrations, one in
firmware (which the above addresses), and another in software.

See Option 3 in
http://tinyurl.com/6yjdn

wrote:
Greetings:

I have an APC SmartUPS 1400RM that I just replaced the (now dead)
included batteries with a pair of 75AH deep cycle marine cells (L/A)
hooked up in series (24V system). At 48% load my runtime is
rediculously small (It's showing me 0 minutes right now)... I've run a
runtime calibration on the UPS, but that doesn't seem to have
helped... Doew anyone have any suggestions, or is this truely the kind
of performance I can expect?...

Thanks,
Richard W.

On Mon, 20 Dec 2004 03:31:42 GMT, Bennett Price
wrote:

Try disconnecting the smart cable and the AC cord and let the
UPS run under your regular load until it shuts itself down.

There appear to be two different runtime calibrations, one in
firmware (which the above addresses), and another in software.


The APC software also lets you specify how many external battery packs
have been added. Just bump up the number as needed. I had to do this
for our 2200 units using the monster APC external units. I have 4
hours of runtime at 80% load, btw.


-Chris

On Tue, 21 Dec 2004 06:09:38 GMT, wrote:



The APC software also lets you specify how many external battery packs
have been added. Just bump up the number as needed. I had to do this
for our 2200 units using the monster APC external units. I have 4
hours of runtime at 80% load, btw.

Anyone know what the AH ratings on the external battery packs are?...
I'm figuring 75AH deep cycle wet cells ought to give me about 30
minutes of runtime at 40% load...

Regards,
Richard.